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Finding the Fourth Proportional to 70,642.88, 105,951.54 and 28,521.20

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Solution

The fourth proportional to 70,642.88, 105,951.54 and 28,521.20 is: 42,776.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,642.88 : 105,951.54 = 28,521.20 : x
  2. Step 2: Convert to fraction form
    70,642.88/105,951.54 = 28,521.20/x
  3. Step 3: Cross multiply
    70,642.88x = 105,951.54 × 28,521.20
  4. Step 4: Simplify right side
    70,642.88x = 3,021,865,062.65
  5. Step 5: Solve for x
    x = 3,021,865,062.65/70,642.88
  6. Step 6: Final answer
    x = 42,776.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.